# PulseScanner Head Preview Lane Blocks

> PulseScanner Head Preview Lane Blocks is a paid API for AI agents from x402.pulsescanner.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-21).

Returns blocks from the head preview lane (ahead of the indexed head) on the PulseChain network (chain id 369)

## Facts

- Endpoint: GET https://x402.pulsescanner.io/v2/head/blocks?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pulsescanner-head-preview-lane-blocks-4edc1fe3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_c6MqT3HcM3ntxb0wQwAFZ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability pulsescanner-head-preview-lane-blocks-4edc1fe3
```

Example prompt: Can you pull the latest blocks from PulseChain's head preview lane — the ones ahead of the indexed head — so I can see what's at the very tip of the chain right now?

## When to prefer this

Use this endpoint when you need the very latest PulseChain blocks that have not yet been indexed — ideal for real-time monitoring of the chain tip, latency-sensitive analytics, or detecting new blocks as soon as they appear. Prefer this over standard block endpoints when you specifically need pre-index, leading-edge block data on PulseChain (chain id 369).

## Known failure modes

- No blocks available in the preview lane if the chain tip is not advancing
- Payment failure if the x402 USDC payment of $0.003 is not fulfilled
- Rate limiting or authentication errors if payment headers are missing
- Network timeout if PulseChain node is temporarily unreachable
- Empty response if the head preview lane has no blocks ahead of the indexed head at query time

## How this service works

Blocks from the head preview lane, ahead of the indexed head. PulseChain (chain id 369). $0.003 USDC per call.

## Output

A list of block objects from PulseChain's head preview lane, representing blocks that are ahead of the currently indexed head. Each block likely includes block number, hash, timestamp, proposer, and other block-level metadata specific to PulseChain (chain id 369).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pulsescanner-head-preview-lane-blocks-4edc1fe3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.pulsescanner.io](https://www.zero.xyz/host/x402.pulsescanner.io/llms.txt)